test: Fix now() tests

[ptiurin]

Description

NOW() function now returns TIMESTAMPTZ, same as postgres. Changing tests to verify the new behaviour.

Checklist

• I have run this code in development and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required/relevant for this PR.
• I have run changie new and committed everything in .changes folder
• I have removed any print or log calls that were added for debugging.
• I have verified that this PR contains only code changes relevant to this PR.
• If further integration tests are now passing I've edited tests/functional/adapter/* to account for this.
• I have pulled/merged from the main branch if there are merge conflicts.
• After pulling/merging main I have run pytest on the included or updated tests/functional/adapter/.

[sonarcloud]

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[ptiurin]

Integration tests passing, as seen in checks with only one test failing. The underlying issue has been fixed on the backend in https://packboard.atlassian.net/browse/FIR-28289 and I'm waiting for that engine version to be deployed in stg.